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Thanks. However, I see no mention of stucco in the MSDS PDF for Cover
Stain oil based primer. I guess I should use something else. I don't
know why, but they told me I should prime the stucco after a month. They
didn't mention paint. This was my roofer.

MSDS is chemistry, health and environ hazards. Click on the button for
technical TDB, Technical Data Bulletin for your product. I think what
your roofer meant was to wait a month before you paint. Mortar has to
cure about that long prior to most paints. Leaving an interval of a
year or two gains chalking and weathering of your primer and lessens the
adhesion of the paint, which is the main reason to have a primer in the
first place.